I continue to be dumbfounded that almost nobody follows Mercedes' recommendation that once you start cranking, KEEP cranking until the engine starts - DO NOT STOP CRANKING - DO NOT TRY A SECOND TIME
I would modify this for an older knob-start machine, as they shut of GP current while cranking. If you didn't heat for long enough additional cranking may be pointless. Key-start cars keep glowing while cranking, different rules! No doubt the correct procedure is in these cars' owner's manuals, but by this time a lot of them are missing. Mine is! -- Jim